.main {
    position: relative;
}

.bg2 {
    min-height: calc(100vh - 12.821vw);
    position: fixed;
}

header::after {
    background: url(../images3/line1.png) no-repeat;
    background-size: 100% 100%;
    position: absolute;
    bottom: -3.718vw;
    content: '';
    width: 100%;
    left: 0;
    height: 7.436vw;
}

.content_ma {
    margin: 2.564vw auto;
    flex-wrap: wrap;
    padding: 3.846vw 0 0;
    box-sizing: border-box;
    display: flex;
    border-radius: 5.128vw;
    border: .256vw solid #0010fe;
}

.content_ma a {
    display: block;
    background: url(../images3/bg_dd.png) no-repeat;
    background-size: 100% 100%;
    width: 50%;
    height: 42vw;
}

.dd1 {
    font-family: 宋体;
    text-align: center;
    font-weight: bold;
    font-size: 2.821vw;
    line-height: 6.769vw;
    letter-spacing: .179vw;
    background: url(../images3/bg_dd1.png) no-repeat;
    background-size: auto 100%;
    background-position: center;
    color: #000993;
    margin-top: -2.564vw;
}

.dd2 {
    justify-content: center;
    display: flex;
}

.dd2_1 h1 {
    font-family: SourceHanSansCN-Regular;
    font-size: 2.564vw;
    line-height: 4.359vw;
    font-weight: bold;
    color: #0010fe;
}

.dd2_1 h1 span {
    display: inline-block;
    width: 5.128vw;
}

.dd2_2 h1 {
    width: 25.641vw;
    font-family: SourceHanSansCN-Regular;
    font-size: 2.308vw;
    line-height: 4.359vw;
    color: #fff;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 1;
}

/* 收录任务列表 */
.slrwlb .dd2 {
    margin-bottom: .4vw;
}

.slrwlb .content_ma a {
    height: 56.13vw;
}

.slrwlb .content_ma a h2 {
    margin: auto;
    text-align: center;
    line-height: 4.93vw;
    width: 85%;
    height: 4.93vw;
    background-image: linear-gradient(0deg,
            #a6ccf3 0%,
            #ffffff 100%);
    box-shadow: 0vw 0vw 0.92vw 0.28vw rgba(21, 38, 151, 0.38);
    border-radius: 2.47vw;
    font-family: SourceHanSerifCN-Regular;
    font-size: 2.67vw;
    font-weight: bold;
    letter-spacing: 0.16vw;
    color: #000993;
}

/* 排名任务列表 */
.pmrwlb .dd2_1 h1,
.pmrwlb .dd2_2 h1 {
    line-height: 5vw;
}